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News

New Vishay Siliconix MOSFET drivers enhance design flexibility

Vishay Electronic : 20 June, 2001  (New Product)
Two new half-bridge MOSFET drivers optimized for single-input, high-frequency switching in dc-to-dc converters were announced today by Siliconix incorporated, an 80.4%-owned subsidiary of Vishay Intertechnology. By offloading the power MOSFET drive requirement from the controller IC, the new devices increase system design flexibility for a wide variety of power conversion designs used in desktop and notebook computers, computer peripheral products, and consumer electronic products.
Two new half-bridge MOSFET drivers optimized for single-input, high-frequency switching in dc-to-dc converters were announced today by Siliconix incorporated, an 80.4%-owned subsidiary of Vishay Intertechnology. By offloading the power MOSFET drive requirement from the controller IC, the new devices increase system design flexibility for a wide variety of power conversion designs used in desktop and notebook computers, computer peripheral products, and consumer electronic products.

The Si9912 and Si9913 single-input dual MOSFET high-speed drivers offer an extended input voltage range of 4.5 V to 30 Va, with a supply voltage of 4.5 V to 5.5 V. Packaged in the 8-pin SOIC, the new Vishay devices integrate drivers capable of switching a 3000-pF load with a 60-ns propagation delay and a transition time of 25 ns. This fast switching speed minimizes switching losses and increases power efficiency.

Outfitted with an integrated bootstrap diode on the high-side driver, both the Si9912 and Si9913 are capable of handling the high voltage slews associated with 'floating' high-side gate drivers. The new devices offer a 1-A drive current that supports switching frequencies up to 1 MHz, making the Si9912 and Si9913 an optimal choice for high-frequency, high-current converters.

The half-bridge MOSFET drivers additionally include several integrated protection features. An undervoltage lockout and an automatic break-before-make circuit prevent shoot-through current in the external MOSFETs and ensure that both the high-side and low-side MOSFETs do not operate at the same time.

Vishay's Si9913 features a synchronous enable pin used to enable the low side driver. As an alternative design option, the Si9912 provides a shutdown pin that enables the driver, with a power-efficient quiescent current of less than 5 A when the driver is disabled. Both devices are fully compatible with Vishay's complete lines of MOSFETs, ceramic capacitors, tantalum capacitors, inductors, and Schottky diodes, thereby providing manufacturers with a wide range of microelectronics components deriving from a single, versatile source.

Samples of the Si9912 and Si9913 are available now. Production quantities will be available in March, with lead times of eight weeks for larger orders.
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